import java.util.HashMap;
import java.util.Objects;

/**
 * Created by Terry
 * Description:
 * User: GAOBO
 * Date: 2021-07-30
 * Time: 9:16
 */


class Person {
    public String id;

    public Person(String id) {
        this.id = id;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id='" + id + '\'' +
                '}';
    }
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Person person = (Person) o;
        return Objects.equals(id, person.id);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id);
    }
}
public class HashBuck2<K,V> {

    static class Node<K,V> {
        public K key;
        public V val;
        public Node<K,V> next;

        public Node(K key,V val) {
            this.key = key;
            this.val = val;
        }
    }


    public Node<K,V>[] array = (Node<K, V>[]) new Node[10];
    public int usedSize;

    public void put(K key,V val) {
        //通过hashcode方法定为 数组的下标
        int hash = key.hashCode();
        int index = hash % this.array.length;
        Node<K,V> cur = array[index];
        while (cur != null) {
            //equals 起的作用是 遍历当前数组下标的key是否相同
            if(cur.key.equals(key)) {
                cur.val = val;
            }
            cur = cur.next;
        }

        Node<K,V> node = new Node<>(key,val);
        node.next = array[index];
        array[index] = node;
        this.usedSize++;
    }

    public V get(K key) {
        int hash = key.hashCode();
        int index = hash % this.array.length;
        Node<K,V> cur= array[index];
        while (cur != null) {
            if(cur.key.equals(key)) {
                return cur.val;
            }
            cur = cur.next;
        }
        return null;
    }


    public static void main(String[] args) {
        //此时 数组多大？
        HashMap<String,String> map = new HashMap<>(1000);
        map.put("123","456");
    }


    public static void main2(String[] args) {
        Person person1 = new Person("12345");
        Person person2 = new Person("12345");
        HashBuck2<Person,String> hashBuck2 = new HashBuck2<>();
        hashBuck2.put(person1,"gaobo");

        System.out.println(hashBuck2.get(person2));
    }

    public static void main1(String[] args) {
        Person person1 = new Person("12345");
        Person person2 = new Person("12345");
        System.out.println(person1);
        System.out.println(person1.equals(person2));
        System.out.println("===================");
        System.out.println(person1.hashCode());
        System.out.println(person2.hashCode());
    }


}
